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Understanding the Potential for Efficient Triplet Harvesting with Hot Excitons

Lookup NU author(s): Dr Julien Eng, Dr Theo Keane, Dr Thomas Penfold

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Royal Society of Chemistry, 2019.

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Abstract

Excited state energy transfer in disordered systems has attracted significant attention owing to the importance of this phenomenon in both artificial and natural systems that operate in electron- ically excited states. Of particular interest, especially in the context of organic electronics, is the dynamics of triplet excited states, which due to their weak coupling to the singlet manifold often act as low energy trapping sites and are therefore detrimental to device performance. Herein, we explore the triplet energy transfer mechanism from dichlorobenzene to thioxanthone in methanol solution. We rationalise previous experimental observations as arising from preferential popula- tion transfer into the lowest triplet state rather than the higher lying triplet state that is closer in energy. The reason for this is a delicate balance between the electronic coupling, reorganisation energy and the energy gap involved. The present results provide the understanding to potentially develop a hot exciton mechanism in materials for organic light emitting diodes (OLED) to achieve higher device efficiencies.


Publication metadata

Author(s): Nothey T, Eng J, Keane T, Penfold TJ

Publication type: Article

Publication status: Published

Journal: Faraday Discussions

Year: 2019

Volume: 216

Pages: 395-413

Print publication date: 01/07/2019

Online publication date: 20/12/2018

Acceptance date: 03/12/2018

Date deposited: 20/12/2018

ISSN (print): 1359-6640

ISSN (electronic): 1364-5498

Publisher: Royal Society of Chemistry

URL: https://doi.org/10.1039/C8FD00174J

DOI: 10.1039/C8FD00174J


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